I ordered an HHO system from PUNCH HHO, and when I received the product I decided that I did not want it, I did not open the package, I just called the supplier, Mr. Tom Punch and Asked for a return authorization. I was told that once it is shipped and received it can not be returned. However on the web site in the disclaimer it says that they will refund your money within 5 days after they receive the procuct back and it is inspected. If you do not want to lose $200.00 plus do not do business with this company.